SKILL.md

Code Formatter

Overview

Formats and validates code files using Prettier and related formatting tools. Supports JavaScript, TypeScript, JSON, CSS, Markdown, and many other file types.

Prerequisites

Node.js (v16+) and npm/npx installed
Prettier available globally (npm install -g prettier) or locally in the project
Write permissions for target files and configuration directories
Supported file types present in the project (.js, .jsx, .ts, .tsx, .json, .css, .md)

Instructions

Check whether Prettier is available by running npx prettier --version. If missing, install it locally with npm install --save-dev prettier or globally with npm install -g prettier.
Detect existing configuration by searching for .prettierrc, .prettierrc.json, prettier.config.js, or a "prettier" key in package.json. If no configuration exists, create a .prettierrc with sensible defaults (see ${CLAUDE_SKILL_DIR}/references/implementation.md).
Run npx prettier --check "**/*.{js,jsx,ts,tsx,json,css,md}" --ignore-path .prettierignore to identify files that need formatting. Report the count and list of non-conforming files.
Apply formatting to identified files using npx prettier --write on the target paths. For single files, specify the exact path; for directories, use glob patterns.
Create or update .prettierignore to exclude generated outputs (dist/, build/, *.min.js, *.min.css), dependencies (node_modules/, vendor/), and lock files.
Optionally set up pre-commit enforcement by installing and , then configuring in to run on staged files matching supported extensions.

Error	Cause	Solution
`prettier: command not found`	Prettier not installed globally or locally	Run `npm install -g prettier` or `npx prettier --version` to use npx
Syntax errors in source files	Malformed code that Prettier cannot parse	Fix syntax errors first using `npx eslint --fix-dry-run <file>` then retry formatting
Configuration conflicts	Multiple `.prettierrc` files or conflicting `editorconfig`	Locate all config files with `find . -name ".prettier*"` and consolidate to a single config
Permission denied on write	File or directory lacks write permission	Run `chmod u+w <file>` to grant write access
Parser not found for file type	Unsupported file extension or missing Prettier plugin	Install the appropriate Prettier plugin (e.g., `prettier-plugin-svelte`) or exclude the file type

curated-code-formatter

Summary

SKILL.md

Code Formatter

Overview

Prerequisites

Instructions

Output

Error Handling

Examples

Resources

Related skills